Hand-punch.



PATENTED SEPT. 29, 1903.

0. H. THUR$TON.

HAND PUNCH. APPLIGATION FILED JAN. 23. 1903.

Pucro-uTm,wAsHmc-To'c 0 c UNITED TATES Patented September 29, 1903.

' PATENT, OFFICE;

CHARLES H. THUBSTON, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO ROBERT A. HAMMOND, OF SANDWICH, MASSACHUSETTS.

HAND-PUNCH.

SPEOIF iCATIQN forming part of Letters Patent No. 740,333, dated September 29, 1903. Application filed January 23, 1903. Serial'lle. 140,294. (No model.)

To all whom it may concern:

Be it known that I, CHARLES H. Tnnns'ron,

a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain Improvements in Hand-Punches, of which the following is a specification.

My invention has for its object to provide a hand-punch having a powerful leverage, whereby thick and hard material may be smoothly and easily punched with a minimum expenditure of force.

With this end in view my invention consists in certain novel features and details of construction, as hereinafter particularly described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a side elevation of a punch constructed in accordance with my invention. Fig. 2 is a central vertical section of the same. Fig. 3 is a transverse vertical section on the line 33 of Fig. 1. Fig. 4 is a transverse vertical section on the line 4. 4 of Fig. 1.' Fig. 5 is, a transverse vertical section on the line 5 5 of Fig. 1. Fig. 6 is a top view of the front portion of the punch.- Fig. 7 is aside elevation of the punch-plunger and punch. Fig. 8 is a top view of the punch-plunger.

In the said drawings, A represents the body of the punch, which is provided with an integral lever-handle 10 and fixed jaws a b, the former being preferably inclined upward, as shown.

B is the punch-plunger, which is provided at its lower end with a punch c and is fitted to slide in a long vertical bearing din the upper jaw a, said plunger being hollow throughout its length to afford a free outlet at its upper end for the waste cut by the punch and the bore of the plunger being preferably made slightly tapering from its upper end to the point where it meets the hollow punch. The lower jaw 19 is provided with a screwthreaded aperture for the reception of a correspondingly-threa'ded die f, with which the punch cooperates, said die, which is of uniform diameter throughout its length, being provided at its bottom with a slot, whereby it may be turned by a screw-driver to vary its distance from the punch, and, if desired, it may be adjusted to bring its upper end below the level of the upper surface of the jaw 1), thereby forming a cup-shaped recess, whereby a washer could be punched and at the same time made concavo-convex.

The upper end of the plunger B is provided with a solid lateral extension 12, projecting inwardly, as shown, through a vertical open slot 9 in the upper portion of the body A, which formsa guide to keep the extension in its proper position as it is moved up and down with the plunger.

0 is the second lever-handle, which in: or-

der to securelightness and strength, combined with elasticity, is preferably composed of sheet-steel doubled in U shape, as shown in Figs. 2 and 5, and thelarger end of said-handle being split to enable its wide side portions 14 1A to embrace the body portion A, as shown, and to which it is pivoted by means of a bolt 2., provided on one side with a head and on the opposite side with a clamping-nut 16. At the outer ends of the two side portions of the lever O are formed open slots 11 i, which engage corresponding'pins or projections in k on the opposite sides of the end of the punchplunger extension 12, whereby as the handles are grasped and brought together by the hand the punch will be carried down to cause it to pass through and punch the material held between it and the die f. When the plunger is in its rased position, the slots 71 t' are inclined downward and inward, as shown, whereby as the short arm of the lever O is depressed the upper edges of the slots '5 11 as they bear on the pins k in will tend to force the plunger away from the lever, thus correcting the tendency of the plunger tobe tipped out of its vertical position by the leverage exerted when pressure is applied to the outer end of the extension 12. The handles are normally kept apart by a bent wire spring D, having one end fitted into a hole in the handle O and the other end fitting into a recess in the handle 10, the lower portion of the spring lying within the groove formed between the sides of the U-shaped handle which forms a guide therefor, whereby. it is partially concealed and at the same time steadied and kept in its proper position.

By providing the punch-plunger with the lateral inwardly-projecting extension 12 the connection between the plunger and the lever 0 is brought very close to the fulcrumpoi-nt h. Consequently a very powerful leverage is secured, whereby thick or hard ma terial may be easily punched with the expenditure of much less force than has heretofore been necessary in hand-operated punches of this description.

The resiliency or spring of the lever 0 causes it, when the grip of the hand is released, to produce a slight upward movement of the punch, which is thus loosened in the material being punched and its withdrawal therefrom thus facilitated.

To the body A is pivoted on a clampingscrew 18 a short arm 20, which when in its normal raised position (shown in Fig. 1) forms a stop for thelever 0, thereby limiting the separation of the lever-handles and preventing the pins Zak of the extension 12 from becoming disengaged from the slots 71 1 of the said lever C. When, however, the stop 20 is swung in the position shown in dotted lines.

in Fig. 1, the lever-handles can be separated sufficiently to cause the pins 70 to clear the slots 11, thereby disconnecting the extension 12 from the lever 0, when the plunger can be removed and replaced, if desired, by another nection between said pivoted handle and the lateral extension of the punch-plunger.

2. A hand-punch comprising a body provided with fixed jaws and a lever-handle, a punch-plunger sliding in the upper jaw and having an inwardly-projecting lateral extension at its upper end, a second lever-handle pivoted to the body and having a detachable slot-and-pin connection with the punch-plunger, and a movable stop adapted in one position to normally limit the movement of the pivoted lever-handle and in another position to allow said lever-handle to be disengaged from the punch-plunger to permit of the removal of the latter. i

3. In a hand-punch of the character described, the combination of the body provided with fixed jaws and a lever-handle, a plunger sliding in the upper jaw and having an inwardly-projecting lateral extension at its upper end, a second lever-handle pivoted to the body and composed of sheet metal doubled in U form and split at its inner end to embrace said body, the sides of said inner end having open slots engaging pins or projections on the lateral extension of the plunger.

4. In a punch of the character described, the combination with the punch-body with its lever-handle and fixed jaws, of the plunger sliding in the upper jawand made hollow throughout its entire length and provided at its lower end'with-a' punch and at its upper end with an inwardly-projecting lateral extension for engagement with the pivoted lever-handle.

Witness my hand this 19th day of January, A. D. 1903.

CHARLES H. THURSTON.

In presence of- JOSEPH K. GREENE, O. A. WESTCOTT. 

